Unionism needs to learn that there's no 'I' in team
Now is no time for slow learners in any of Northern Ireland's camps - the Brexit challenges are too pressing to allow for that. So, the number one lesson to emerge from Stormont's collapse is that while hardliners wear various guises, they can never be the future.
You could call it the Arlene Foster Tutorial. Or how not to behave in a power-sharing arrangement.
It would be helpful if Sinn Féin shows that the Foster lesson has been absorbed in its choice of a new leader for the Northern Assembly. That message can be reduced to just one word: 'Us'. Not the 'us' of party interests but the 'us' of the Northern community's common interests, nationalist and unionist alike.